package xiaohu.day3.HJ34;

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNextLine()) {
            char[] chars = scanner.nextLine().toCharArray();
            Arrays.sort(chars);
            System.out.println(chars);
        }
    }
}
